【Build, Play, Explore】294-Piece Marble Run Engineering Toy is a set of wooden & plastic pieces used for constructing mazes for marbles. It promotes STEM skills and provides an educational and fun activity for adults and children/teens to engage in. 【Cool Perpetual Motion Science Kits】The ROBOTIME 3D Wooden Marble Run is powered by hand cranking, mechanical gear rotation, endless loop steel balls (package include 10 metal balls), you can feel the charm of machinery. 【It’s Worth the Time】The toy building set is featured with a brilliant design and teaches patience, problem-solving, and engineering, cultivate hand eye coordination ability. With detailed instruction book, you will know how to use each piece, building your maze is easy! 【100% Safe Material】This 3D wooden puzzles cut with exquisite laser technology, all parts are made of high-quality, non-toxic, tasteless and recyclable safety materials, no tools nor glues needed. 【After-Sale Service】If you have any questions in assembling, such as damaged or missing parts, please feel free to contact us and we will reply you within 24 hours. We are always here! ROBOTIME 3D Puzzles Mabrle Run - LGA01 Marble Night City Wooden Model to Build - Model Building Kits for Adults